Boat.



A. GURRIE.

BOAT.

APPLIGATION FILED APR. 11 1910.

Patented Dec. 16, 1913.

1 UNITED STATES-PATENT OFFICE.

ALEXANDER GURRIEE, OF LGS' ANGELES, CALIFORNIA, ASSIGNOR 0 3? ONE-THIRD TO ALEX. Hi. BIDDERS, OF L05. ANGELES, GALIFQRNIA. I

BOAT.

To all whom it may concern: I

Be it known that I, ALEXANDER Connie, a

subject of the King of Great Britain, residin the county of Los ing at Los Angeles, Aiigeles, State of California, have invented a certain new and useful Boat; and I do hereby declare the followingnto be a full,

ticularly to-boats of the typeknown as by droplanes which are designed to be raised but of the water and glide on the surface thereof when running at high speed.

The invention has for one of its objects to provide a configuration for the under surface or bottom of the-boat which will be particularly. adapted, by its action upon the water when the boat is running, to lift the boat. I

Another object of the invention is to pro vide a formation for the under surface ofthe boat which will cause the water to offer a minimum resistance to the passage of the boat when running at high speed. N

Another object of the invention is to provide a formation for the under surface of aboat in which a series of surfaces of special configuration comesuccesslvely into contact with the surface of the water when the boat is lifted upon increase of speed.

Another object of the invention is to provide the under surface of the boat with a series of upwardly and forwardly inclined surfaces s0 arranged that the waste of power due to the forward thrust of the inclined surfaces against the water may be reduced as the speed of the boat increases.

Still another object is to provide 'a construction for, the. bottom of a boat of the described typewhich will cause the boat to maintain its balance both longitudinally and transversely when running at high speed.

lVith the above ancl-otherobjects and advantages in view which will be apparent to those skilled in the art from a consideration of the following description and accom panying drawings in which a construction embodyin the invention is described and illustrate the invention may be said to consist of the construction, arrangement and combination of parts as; hereinafter de- Specification of Letters Batent. I

Application filed April 11, 1910. Serial N 0. 554,863.

Patented Dec. 16, 1913.

scribedand particularly pointed out in the claims. 7 Referring now to the drawingsLFigure l is an underside plan view of a boat hav= ing the invention embodied therein. Fig. 2 1s a longitudinal sectional view thereof. Fig.v 3 is a transVersesectiOnal view taken on line 33 Fig. 2, and Fig. 4 is a transverse sectional view taken on line ll Fig. 2.

Theupper part of the hull of the boat is indicated at l andmay be usual construction with a pointed how 2 so that when running at low-speed and with a comparatively large amount of the hull submerged it may cut the water -easily.- Any suitable propelling means, not necessary provlded.

In order to cause the 'boat to rise in the to be shown, may be water as its speed increases its bottom is pref erably formed with a series of upwardly and forwardly inclined surfaces. If desired the bottom of the boat may be formed in two sections 3, and 4- arranged in tandem and each; having 'a-series of upwardly and for wardly inclined surfaces arranged adjacent to one another. These surfaces are preferably arranged'in echelon and may include a central surface 5, on either side of which may bear-ranged any desired number of side.

surfaces; four of such. surfaces 6, 7, 8 and 9 respectively, being shown on each side'of the central surface. These surfaces are preferably arranged in stepped relation with each other as shown particularly in Figs. 3 and 4 with the central surface highest; vcr- 'tical walls 10 connecting each surface with the adjacent one.

By arranging the surfaces'as pointed out in the previous paragraph the boat will be kept in equilibrium when running at high speed as the surfaces-farthest apart transversely wlll be always resting on the water while at the salnetime the sharp edges 11 atthe juncture 9f the wall lO and the converging sides of the how 2 will tend to cut the waves and lessen the jar caused by the waves striking the boat; also the'lifting action of the central surface will be increased by preventing the escape of water at the sides.

As shown here the lower surface Q'Jnay be formed of a thin strip projecting out beyond the sides 12 of the boat so that the lifting surface can be made of considerable proportion,

of the water to dismay be arranged to have slightly decreas- 2 5 center line of tdecreased length as shown.

figuration mg angles of inclination, from the highest surfaces 5 with the greatest angle of inclination to the lowest surface 9 with the smallest angle of inclination; the object being to reduce as much as possible the waste of power due to the forward thrust of the surfaces against the water by making the thrust of the surfaces remaining in the water when the boat is traveling at highspeeds act in-a direction more nearly vertical. Also, the surfaces, laterally from the In order to ake these surfaces especially adapted by their action upon the water, to lift the boat they are preferably given a particular conlongitudinally thereof. As shown particularly in Fig. 2 these surfaces are preferably curved concavely to substantially a parabolic form. The parabolic curve is preferred because each particle of water coming in contact with the surface presses evenly against the latter throughout its entire length and is not deflected away from the surface as would be the case were surfaces not of substantially parabolic curvature employed. Also, as will be understood by those familiar with the properties of the parabola, the downward pressure due to the force of gravity tends to press the water adjacent to the surface toward a common point.

In order any loss of lifting our, in case the boat to minimize as much as possible efficiency which might ocshould be traveling with one of the surfaces partly out of the water, by the surface not meeting the water at the beginning of the parabolic curve any desired number of these surfaces may be formed to provide acontinuous lifting surface adapted to present a plurality of surface-sections, each preferably concave in longitudinal section, arranged in series with the front surface section highest, and

each succeeding section lower than the one front and merging into it, so that the upward inclination of the surface as a whole toward the front is preserved; the object being to cause the surface when partly out of the water to strike the latter at the beginning of a paraboliccurve.

The central surface 5 and the adjacent the boat, may be of gradually oneabehind the othersurfaces 6 are preferably formed with a plurality of substantially parabolically curved surfaces 5, 5", 5, and 6, 6", 6, respectively, arranged relatively to each other in the manner pointed out-in the preceding paragraph; the reason that the higher surfaces are shown as provided with the plurality of curves being that they are preferably as before stated of greater inclination than the lower surfaces, and are likely to be raised out of the water more frequently than the latter. For reasons already pointed out the surface sections 5, 5", 5, and 6, 6, 6,

may also be arranged with the lower rear sections having smaller angles of inclination than the upper front ones. In varying the inclination of the parabolically curved surfaces the curve of the parabola is also preferably varied accordingly. As shown at 19 in the drawi the surfaces may be convexly curved at their rear ends and such curvature may also be parabolic.

It will be obvious of course that various changes and modifications might be made in the precise construction shown and the right is therefore reserved to all such changes and modifications as come within the spirit and scope of the invention as defined in the appended claims.

I claim:

1. A boat having its bottom provided with a plurality of upwardly and forwardly inclined laterally stepped surfaces having varying angles of inclination, one of said surfaces arranged substantially centrally of and above the others.

2. A boat having its bottom formed with a series of inclined surfaces, including a central surface, and side surfaces arranged in stepped relation with the central surface, the central surface being higher than the side surfaces.

3. A boat having its bottom formed with a series of inclined surfaces arranged adja cent to each other and comprising higher and lower surfaces, the higher surfaces having greater angles of inclination to the horizontal than the lower surfaces.

4. A boat having its bottom formed with a series of inclined surfaces, including a central surface, and side surfaces arranged in stepped relation with the central surface, the central surface being higher than the side surfaces and having a greater angle of inclination than the latter.

5. A boat having its bottom provided with a plurality of latera ly stepped surfaces including a surface 5 formed with a plurality of curved surface-sections 5, 5 and 5 arranged one behind the other with the front surface-section 5 highest and each succeeding surface-section lower than the one in front of it.

6. A boat having its bottom formed with a series of curved surfaces arranged side by plurality of stepped lifting side instepped relation one below the other laterally thereof, such surfaces being up-- wardly and forwardly inclined, the angle of inclination of the lower surface being smaller than the angle of inclination ofthe higher surface.

7. A boat having its bottom formed with a plurality of lifting surfaces, a portion of the surfaces each comprising a plurality of curved sections upwardly and forwardly inclined and arranged one behind the other with the front section highest and each succeeding section lower than the one in front of it, the lower rear sections having smaller angles of inclination than the upper front ones.

S.'A boat. having its bottom formed with surfaces, the higher surfaces each formed to provide a plurality of curved sections arranged one behind the other with the front section highest and each succeeding section lower than the chem front of it, said sections connected together to form a continuous surface having-an upwardinclination toward the front'of the boat.

9. A boat having its bottom formed in spaced sections arranged in tandem and each comprising a series of upwardly and forwardly inclined surfaces.

10. A boat having its bottom formed of a plurality of lifting surfaces arranged in stepped relation, with the higher of the sur faces arranged substantially centrally of the boat and the lower of the surfaces arranged laterally beyond the sides of the boat.

11. A boat having its bottom' provided with stepped lifting surfaces and substantially vertical walls between said surfaces, the lower of the surfaces being farthest laterally from the center line of the boat.

12. A boat having its bottom formed with. curved inclined lifting surfaces in eluding a central surface and surfaces on each side thereof, said surfaces arrangedinstepped relation with the central surface highest.

13. A boat, having its bottom provided with stepped lifting surfaces and substantially vertical walls between said surfaces, the central surface being highest in position.

14. A boat having its bottom provided with upwardlyand forwardly inclined lifting surfaces, including a central surface and side surfaces arranged in stepped relation with the central surface, the central surface being higher than the side surfaces. 15. A boat having its bottom provided with lifting surfaces having different angles of inclination, including a central surface and side surfaces arranged in stepped relation therewith, the central surface being higher than the side surfaces.

16. A boat having its bottom provided with a plurality of laterally stepped surfaces including an inclined lifting surface 5 comprising a series of curved sections 5f,

5 and 5 arranged one behindthe other.

17 A boat having a bow formed by converging sid es thereof and provided on its bottom with a plurality of lifting surfaces, including a central surface and side surfaces below thecentral surface and vertical walls between the surfaces, said walls and converging sides at their juncture forming edges adapted for the purposes set forth.

18. A boat having a bow formed by converging sides thercof and having its bottom provided with a plurality of lifting surfaces including a central surface and side surfaces therebelow and vertical walls connecting-each surface with the adjacent one, said walls and converging sides at their juncture forming edges adapted for the pur poses specified.

19. A boat having its bottom provided with curved upwardly and forwardly inclined lifting surfaces, said surfaces, laterally from the center line of the boat, being of gradually decreased length.

20. A boat having its bottom formed with upwardly and forwardly inclined lifting surfaces arranged in stepped relation with each other, the lower surfaces having the smallest angle of inclination, said surfaces, laterally from the centerline of the boat, being of gradually decreased length.

In testimony whereof, I have signed my name to this specification in the presence of two subscribing Witnesses at Los Angeles, county this 5th day of April, A. D. 1910.

ALEX. CURRIE,

Witnesses:

ALEX. H. LIDDERS, FRED A. MANSFIELD.

Copies of thin patent may be obtained for five cents each, by addressi ng the Gommissioner'of Patents,

" Washington, D.- O."

of Los Angeles, State of California, 

